この研究は、パルス化RFばく露はアルファ波活動に影響するが、連続波のRFは影響しないという仮説、及び、GSM様の低周波パルスがアルファ波活動に影響するという仮説を検証するため、安静時の脳電図(EEG)のアルファ波活動へのGSM様の電磁界の影響を、二重ブラインド・クロスオーバー実験パラダイムで調べた。72人の健康なボランティアは2時間の開眼、安静時EEG活動の記録セッションに参加した。2時間の記録セッションを、30分間ずつ4つに分割し、各分割セッションで偽ばく露、パルス変調RF、連続RF、低周波パルスを、ばく露順はボランティア全体でカウンターバランスして与えた。30間分中の20分間はばく露、その前後の5分間はベースラインデータと事後データを記録した。その結果、偽ばく露と比較して、パルス変調RFばく露下では、全体的なアルファ波活動の抑制が認められ、これは連続RFばく露と同様であった;ELF条件では影響は認められなかったことなどから、RFによるアルファ波活動の変化は観察されたものの2つの仮説は支持されなかったと報告している。
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To examine the effect of exposure to pulsed or continuous GSM-like electromagnetic fields on the resting EEG alpha wave activity in humans.
In many studies, indications of an effect of pulsed radiofrequency electromagnetic fields on the EEG have been found (for example Curcio et al. 2005, Croft et al. 2008).
72 healthy volunteers (35 females) were examined under: 1) sham exposure, 2) continuous radiofrequency exposure, 3) pulsed radiofrequency exposure and 4) pulsed extremely low frequency magnetic exposure. Participants attended a two hours recording session which included four 30 minutes intervals (four minutes break in between) where the order of exposure was counter balanced. In each 30 minutes interval, the first five minutes served as baseline, followed by 20 minutes exposure and five minutes post exposure period. Between the intervals, the arousal state was determined.
ばく露 | パラメータ |
---|---|
ばく露1:
Modulation type:
CW
ばく露時間:
continuous for 3 x 20 min
|
|
ばく露2:
Modulation type:
pulsed
ばく露時間:
continuous for 3 x 20 min
|
|
ばく露3:
2.1–217 Hz
ばく露時間:
continuous for 3 x 20 min
|
Participants were exposed in 4 times 20 min sessions with a 4 min break between exposures: 1) sham exposure 2) continuous RF exposure 3) pulsed RF exposure 4) ELF exposure
Modulation type | CW |
---|
ばく露の発生源/構造 |
|
---|---|
チャンバの詳細 | handset was placed in ear-to-mouth position (held via a cradle), over the right hemisphere; speaker and antenna located over the auditory canal; another handset (not radiating), but otherwise identical, placed on the left side of the head |
Sham exposure | A sham exposure was conducted. |
測定量 | 値 | 種別 | Method | Mass | 備考 |
---|---|---|---|---|---|
SAR | 1.95 W/kg | spatial average | - | 10 g | - |
Modulation type | pulsed |
---|---|
Additional information |
GSM-DTX signal |
ばく露の発生源/構造 |
|
---|---|
Sham exposure | A sham exposure was conducted. |
周波数 | 2.1–217 Hz |
---|---|
タイプ |
|
波形 |
|
ばく露時間 | continuous for 3 x 20 min |
Additional information | GSM-DTX-like pulsing |
ばく露の発生源/構造 |
|
---|---|
Sham exposure | A sham exposure was conducted. |
Exposure to pulsed radiofrequency electromagnetic fields significantly changed the alpha wave activity when compared to sham exposure. However, no significant differences were found between the exposure to pulsed and continuous radiofrequency fields, where a slight but not significant difference in the EEG was found in comparison to sham exposure.
Compared to sham exposure, no significant effect of pulsed extremely low frequency magnetic exposure on the EEG activity was observed.
The results indicate that the alpha waves of the resting EEG are altered by radiofrequency electromagnetic fields, but do not support the hypothesis that the pulsing is essential for this effect.
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